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4CX20000A Transmitting Tube, Tetrode, 8990/4CX20000A, RFP Rebuilt

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4CX20000A  Transmitting Tube, Tetrode, 8990 / 4CX20000A, MFR: RFP Rebuilt

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4CX20000A  Transmitting Tube, Tetrode, 8990 / 4CX20000A, RFP Rebuilt

The 4CX20,000A/8990 is a power tetrode intended for use in audio or radio frequency applications. It features an internal mechanical structure which results in high RF operating efficiency. Low RF losses in this structure permit operation at full ratings up to 110 MHz and at reduced ratings to 220 MHz. The 4CX20,000A/8990 has a gain over 18 dB in FM broadcast service, and is also recommended for radio frequency linear power amplifier service, and for VHF-TV linear amplifier service. The anode is rated for 20 kW of dissipation with forced air cooling and incorporates a new highl efficient cooler design, which significantly reduce air pressure and flow requirements an produces low acoustical noise.

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